While vacationing in Miami, the former *NSYNCer saved a baby from getting hit by an umbrella on a beach.

This is what happened: As a helicopter flew by, it got awfully close to the beach. Toooo close. The force from the chopper's rotors hurled an umbrella across the beach where it was headed toward an unsuspecting baby.

Luckily, for that baby, and everyone else around him, a hero was sitting nearby.

JC saw the umbrella and swooped in and grabbed it before it fell on the child.

OMG!! Such heroics!

Hotel security said that he was "sweet and humble" about the fact that he just saved a baby's life because well, you know, as a former member of *NSYNC, he enjoys tearin' up our hearts.